Waterproofing composition



Patented Apr. 29, 1924.

PEARL E. ULLRIGH, OF CHICAGO, ILLINOIS.

WATERLPEOOFING COMIPOSITION.

No Drawing.

To all whom it may concern:

Be it known that I, Pram. E. TJLLRIGH, a citizen of the United States, residing at Chicago, in the county of Cook and State of lllinois, have invented. a certain new and useful Improvement in lVaterproofing Compositions, of which the following is a full, clear, concise, and exact description.

My invention relates to waterproofing compositions.

The primary object of my invention is to provide an improved waterproofing composition for paper, leather and the like.

There is a considerable demand in the art for a waterproofing composition for paper which will make paper substantially waterproof and yet tough and strong. Such paper is highly desirable for making sacks for holding cement, lime. plaster and the like. There is also a great demand for waterproof wrapping paper, building paper, and the like.

Particularly in connection with the manufacture of paper sacks or bags for cement and the like invention of importance.

Sacks for this purpose now made of nonwaterproofed paper are not satisfactory. Moisture is readily absorbed by the fiber of the paper. This produces two undesirable results First, it weakens the structure of the bag. and second. it spoils the contents.

In order to acquaint those skilled in the art with the manner of preparing and using the compound. of my invention and the resulting product, I shall now describe a specific embodiment of my invention.

For waterproofing paper as for instance in making bags for cement and the like, I prepare a waterproofing composition comprising by volume.

25% tar.

25% drip oil.

50% belt dressing compound.

The drip oil is a by-product of water gas, the oil being drawn from the drips after the gas has been manufactured.

Instead of drip oil, I may employ benzol or other solvent oils. A light oil capable of dissolving tar is required. Its purpose is to thin the tar and I might term it a diluent or carrier.

The belt dressing compound is a condensed residue of base oil obtained from enriching water gas with petroleum oil. The specific manner of treating the base oil to secure the belt dressing compound is dis- Application filed January 30, 1922.

Serial No, 532,911.

closed in my prior Patent 1,429,467 issued Sept. 19, 1922, to which I make reference for a detailed. description of the .aine and the manner of producing it.

The tar is first melted and the drip oil is then added and stirred. into the same, the mass being kept warm. Thereafter the belt dressing compound, preferably warm, is poured into the mass and thoroughly stirred into the same. The resulting waterproofing composition is maintained hot at about the boiling point of water and the paper to be waterproofed, preferably a tough manila paper such as is at present employed for making bags for cement and the like, is then passed through the hot composition and thereafter passed through heated rolls to take off the excess of composition and to assist in driving off volatile constituents. The paper is then ready for cutting and pasting or stitching into bags.

In my composition, the tar serves primarily as a filler of the fiber of the paper and gives body to the finished composition. The drip oil or solvent oil acts primarily as a solvent and a carrier for thinning and depositing the tar. The belt dressing compound appears to do several things; first, it keeps the paper pliable and prevents hardening when the solvent or wash oil evaporates or is driven off and second, it toughens the paper. Finally it imparts a smooth exterior finish. The entire composition Waterproofs and preserves the body of the paper.

The paper may be employed in any way desired. I find that the above treatment is especially valuable in tough fibrous paper, such as manila paper or Kraft paper, but I find also that it may be used to advantage on any kind of paper which is to be water proofed.

The condensed base oil appears to be nondrying in its character. It does not appear to dry up or oxidize even under long periods of exposure and it is of such tenacity and high surface tension that it does not readily wash, rub, or wear off, nor does it at any ordinary temperatures congeal or run. This makes it particularly valuable for a waterproofing composition for general industrial purposes, although it is not generally suitable for packing foods and the like unless deodorized.

I find that the belt dressing compound if suitably thinned, as by means of drip oil, solvent oils or other diluent or carrier may light oil to one pifif'i; pound. m 1 passed $11 ough "M he mixture 1' he exec 1 SM is sq 1 v 7 JJ 1 7:01.33 mm me 01 1, 0.1 m

hot rolls or "unto s11; 

